已经看到类似的问题，但没有解决方案。我的应用程序将产品信息保存到txt文件“ storage.txt”中。它临时（用于调试）将文件的内容显示为多行文本视图。我是Java的新手，并且具有其他语言的经验，我认为这使我无法在这里看到此问题。我需要做的是从“ storage.txt”中读取一行，将其上传到数据库，读取下一行，然后重复（如果有可用的网络）。如果没有可用的网络，则使用失败的上传覆盖存储。问题是，当单击按钮并且网络可用时，应用程序崩溃。
private void readFromStorage (Context context){
try {
InputStream inputStream = context.openFileInput("storage.txt");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
//StringBuilder tagBuilder = new StringBuilder();
List<String> tags = new ArrayList<>();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
if(isNetworkAvailable()) {//network found, submit to site and place, do not rewrite to file
if (!receiveString.matches("")) {
sendToServer(receiveString);
}
}else{//network not found, rewrite to file
if (!receiveString.matches("")) {
tags.add(receiveString);
}
}
stringBuilder.append("\n");
}
inputStream.close();
//take new table and write to file, hopefully empty
for(int i = 0; i < tags.size(); i++) {
String str = tags.get(i).toString();
fileRead.append(str);
writeToFile(str, context);
}
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
}
private void sendToServer (final String sendString){
if (sendString != null) {
String[] separated = sendString.split(";");
caliperTXT = separated[0];
weightTXT = separated[1];
widthTXT = separated[2];
typeTXT = separated[3];
vendorTXT = separated[4];
poTXT = separated[5];
aisleTXT = separated[6];
plantTXT = separated[7];
final StringRequest stringRequest = new StringRequest(Request.Method.POST, server_url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
builder.setTitle("Server Response");
builder.setMessage("Response: " + response);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(readStorage.this, "An error has occured", Toast.LENGTH_LONG).show();
error.printStackTrace();
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("caliper", caliperTXT);
params.put("weight", weightTXT);
params.put("width", widthTXT);
params.put("type", typeTXT);
params.put("vendor", vendorTXT);
params.put("po", poTXT);
params.put("aisle", aisleTXT);
params.put("plant", plantTXT);
return params;
}
};
MySingleton.mInstance(readStorage.this).addTorequestque(stringRequest);
}
}